I'm going to put a SE compensator and the direction say torque to 140lbs my torque wrench only goes to 80lbs and my impact is 200lbs would it be ok to just put the bolt on with my impact ? Thanks

 

No... dont do that. An impact can cause damage to threads & such when tightening.
Buy or borrow a torque wrench & do it correctly. Even a Harbor Freight torque wrench will get you fairly close & is better than an impact.

Just my opinion...